Aquatic telephones let skin divers talk under water This swimmie-talkie uses water as a medium for sending high-frequency sound waves, on the principle of the hydrophone employed in the early 1900′s for communicating between ships, and in World War I for detecting submarines. Being adjusted here on a frogman, the Aquavox includes a face-mask mike, [...]
Aquatic telephones let skin divers talk under water This swimmie-talkie uses water as a medium for sending high-frequency sound waves, on the principle of the hydrophone employed in the early 1900′s for communicating between ships, and in World War I for detecting submarines. Being adjusted here on a frogman, the Aquavox includes a face-mask mike, [...]
